[Solved] Identify the error in this interceptor code:intercept(context, next) { return next.handle().pipe(map(data => data * 2)); }Assuming the controller returns an object, what is wrong? | NestJS

NestJS - Interceptors

Identify the error in this interceptor code:

intercept(context, next) {
  return next.handle().pipe(map(data => data * 2));
}

Assuming the controller returns an object, what is wrong?

AMultiplying an object by 2 causes a runtime error

Bmap operator is not imported

Cintercept method missing async keyword

Dnext.handle() should be awaited

Step-by-Step Solution

Solution:

Step 1: Analyze the map function logic
The code tries to multiply data by 2, but data is an object, not a number.
Step 2: Understand JavaScript behavior
Multiplying an object by a number results in NaN or runtime error depending on context.
Final Answer:
Multiplying an object by 2 causes a runtime error -> Option A
Quick Check:
Cannot multiply object by number directly [OK]

Quick Trick: Check data type before arithmetic in map [OK]

Common Mistakes:

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